Many photovoltaic inverters manufacturers provide their one software in order to size and design a PV system. Usually they propose solar panel database and worldwide solar and temperature database.
All these softwares are free but obviously the inverter database of each is limited to that of the manufacturer. Moreover the quality and accuracy of the calculation is not guaranty and the features of the softwares are limited.
New PVSize 2 software tool is free and easy-to-use system dimensioning and performance prediction tool for photovoltaic (PV) systems using ABB solar inverters (ex POWER-ONE, Aurora inverters). The tool is intended for customers and system designers for finding proper solar array and inverter combination.